Ring-closing metathesis as a new methodology for the synthesis of monomeric flavonoids and neoflavonoids
作者:Bradley J. Miller、Tanya Pieterse、Charlene Marais、Barend C.B. Bezuidenhoudt
DOI:10.1016/j.tetlet.2012.06.094
日期:2012.8
Basic flavonoid (flavene) and neoflavonoid (neoflavene) skeletons were successfully synthesized using ring-closingmetathesis, showing that this methodology can be used as a central synthetic tool for the synthesis of at least two of the three basic flavonoid classes.
The synthesis of the racemates (±_-4-methoxydalbergione (IIIa) and (±)-3,4-dimethoxydalbergione (IIIb) has been achieved by Claisen rearrangements of the corresponding cinnamyl ethers (Ia and Ib) followed by Fremy's salt oxidation. These syntheses are based upon the biosynthetic schemes examined in Part II of this series.